So, is this a 67 Starthearn composed of Ysart "leftovers"?
Well, I wouldn't call them "leftovers" - that could imply things that were "not wanted". Probably many thousands of cane slices with the same design were produced. Over the years from their first making, as early as the 1930s for some of them, these canes were simply used by the succession of workers at the Ysart Brothers (Vasart), Vasart Ltd and then Strathearn incarnations of the company.
It would not make good business sense to throw away canes that were still available. After all, these weights that various collectors now spend good sums on actually started out as "gift weights" (ie not made for a specific "collectors market").
How would this paperweight be described?
Very simply as ... "Strathearn PS21 signed and dated". But an extra note can be added: "Contains some canes which were made before the company was renamed as Strathearn."
In studying the canes in this weight I can't actually be sure that,
other than the date cane, any of them are true Strathearn canes (ie made from 1965)! The crisp-looking orange-white-blue complex cane may be a Strathearn creation but I have been caught out before by "better" canes ... a good number of well-formed canes are now known from Vasart items.